Copycat is a law that penalizes you for performing the same action (apart from "Wait") as the last character to perform an action, whether it is a friend or a foe. If the last character did a regular attack, performing a regular attack will get you a card. If the last character cast Firaga, casting Firaga will get you a card. Etc...
I haven't played FFT, so I can't comment on a comparison of the two games, but FFTA has tons of skills.
Soldier, Paladin, Fighter, Thief, Ninja, Black Mage, White Mage, Blue Mage, Illusionist, Archer, Hunter, Time Mage, Animist, Gunner, Mog Knight, Juggler, Gadgeteer, Sage, Beastmaster, Morpher, Alchemist, Warrior, Gladiator, Bishop, Templar, White Monk, Defender, Fencer, Red Mage, Summoner, Elementalist, Sniper, and Assassin.
That's 33 Jobs, each with its own complete set of Abilities (and that's assuming that I didn't forget any). If you think there are too few skills, you should try experimenting with them all first.